Pitman-connection for harvesters



, (No Model.)

0. M. 8vfM. G. McMILLAN. PITMAN CONNECTION FOR HARVBSTERS. No. 254,490.Patented Mar. 7,1882.

W- I I a wemziw.

" UNITED STATES:

PATENT OFFICE.

OLIVER, M. MOMILLAN AND MOSES O. MCMILLAN, OF CLINTON COUNTY, OHIO.

PlTMAN-CONNECTION FOR HARVESTERS.

SPECIFICATION forming part of Letters Patent No. 254,490, dated March'7, 1882.

Application filed July 27, 1881. (No model.)

vented a new and useful Improvement in Pitman-Connections forHarvesters, which is fully, clearly, and exactly set forth in thefollowing specification.

Our invention relates to the heads or connecting ends of the pitman-rodconnecting the flywheel with the sickle of a harvester, and it appliesto either end of the same.

The connecting ends of pitmen inharvesters as now constructed soon wearso as to be useless, and require to be often replaced,-sometimes as manyas two or three times in a season. When loose from wear the lost motionin the eonnectin g parts ea uses knocking, and in some instances the rodis broken before the machine can be repaired.

The object of our invention is to obviate these defectsbyprovidingapitman-connection which is of little cost, and which allowsthe lost motion from wear to be easily and readily taken up, requiringno tools of any kind either to adjust it or to fitanew one upon the endofthe rod.

The pitman-head is made of malleable iron in two parts, dividedlongitudinally in the middle (horizontally) through the axial line ofits bearings. The two parts of the pitman-head are hinged together attheir extreme ends, the larger section (into which the rod enters and issecured by a screw-thread) being cut half-way through beyond the end ofthe rod. The smaller one shuts down with its inner end against theshoulder of the main piece, so as to leave the entire outer part of thehead smooth and free from projections. The head, when closed, is heldsecurely by a spring-bolt. A packing for the bearing in the headconsists of two light semi-cylindrical pieces, one in each half of thehead, which are provided with a lug extending laterally from the middleof each side. These lugs restin aslot or notch on each side in the head,which prevents displacement of the packing and allows of each piece ofpacking being both reversed (end for end) and interchanged. This featureof the packing causes it to wear much longer, and the bearing to runsmoother and without noise or rattling.

Figure 1' is a longitudinal section of the pitman-head and a part of theattached rod, the view being through the axial line of rod and head.Fig. 2 is a top view of the head and a part of the attached rod. Fig. 3is the same view of Fig. 2 with the upper section, a, removed. Fig. 4shows views of the packings.

A is the pitman-rod; a, the pitman-head, which is made of malleable ironin two parts, a and a, and accurately fitted and connected together by aginglymus or hinge joint, 0, at the end. The opening in the headfor thewrist of the crank-wheel or pin of the sickle-head is near the hingeend, and is divided equally in each section, so that a line dividing itcentrally would pass through the division-line between sections a and a.A spring-bolt, d, is incased in the main section a of the head in linetherewil;h,'(c is screwed upon rod A in the usual manner,) and projectsfrom the shoulder c. The front end of the bolt is beveled to facilitatethe closing down of the hinged top section, a, which pushes the boltback as its end 6 is closed down, allowing the bolt to spring into ahole drilled in the end 6 for the purpose, as seen in Fig. 1.. Thepitman-head is entire from the neck end d to the shoulderpoint e, whereit is cut down to the middle, making the two longitudinal halves fromthis point to the hinge end f, the head being divided through the axialline of its bearings.

The packing 9 may be of any anti-frictional material suitable for thepurpose. The lug h keeps as firmly in place as if it were held in theusual manner by heads and a countersink on either side, and the cost ismuch less.

The bolt (1 is preferably round, and it has a thumb-catch, i, extendingup into the slot f, so as to operate it. Additional packing i, (seenbetween the two halves of the head,as seen in the view, Fig. 1,) ofrubber or leather, may be introduced when the pieces are first fittedand afterward removed as the wear allows the parts to approximate.

We claim as our improvement in pitmanconnections for harvesters 1. Theself-fastening head a, having the two parts a a, hinged together attheir extreme outer ends and provided with the self-fastening bolt d,substantially as shown and specified, for the purpose set forth.

2. In a pitman-rod head divided in two sections hinged together, asshown, aself-fastening bolt by which said sections are united, and athin metallic reversible and interchangeable packing having centraltransverse lugsfitting 10 in slotsin the two opposite sections of thehead, substantially as hereinbefore set forth.

OLIVER M. MGMILLAN. MOSES G. MGMILLAN.

Attest:

R0121. E. DOAN,

JAMES W. BRAUN.

